FG Mehrphasenreaktionstechnik

19 Items

Recent Submissions
Efficient Advanced Oxidation Process (AOP) for Photocatalytic Contaminant Degradation Using Exfoliated Metal-Free Graphitic Carbon Nitride and Visible Light-Emitting Diodes

Rana, Adeem Ghaffar ; Tasbihi, Minoo ; Schwarze, Michael ; Minceva, Mirjana (2021-05-23)

The photocatalytic performance of metal-free graphitic carbon nitride (g-C3N4) was examined using visible light-emitting diodes (LEDs). A comparative and parametric study was conducted using the photocatalytic degradation of phenol as a model reaction. The g-C3N4 photocatalyst was synthesized from melamine using thermal condensation, followed by a thermal exfoliation that increases the catalyst...

Deriving Economic Potential and GHG Emissions of Steel Mill Gas for Chemical Industry

Collis, Jason ; Strunge, Till ; Steubing, Bernhard ; Zimmermann, Arno ; Schomäcker, Reinhard (2021-05-19)

To combat global warming, industry needs to find ways to reduce its carbon footprint. One way this can be done is by re-use of industrial flue gases to produce value-added chemicals. Prime example feedstocks for the chemical industry are the three flue gases produced during conventional steel production: blast furnace gas (BFG), basic oxygen furnace gas (BOFG), and coke oven gas (COG), due to t...

Integration of techno-economic and life cycle assessment: Defining and applying integration types for chemical technology development

Wunderlich, Johannes ; Armstrong, Katy ; Buchner, Georg A. ; Styring, Peter ; Schomäcker, Reinhard (2020-11-07)

Both an environmental and an economic assessment are needed to judge the potential of sustainable chemical technologies. However, decision-makers may be challenged by conflicting conclusions. The integration of life cycle assessment (LCA) and techno-economic assessment (TEA) can enhance decision-making, as integrated assessments provide more information than a simple reporting of separate TEA a...

Techno-economic assessment of CO2-containing polyurethane rubbers

Buchner, Georg A. ; Wulfes, Nils ; Schomäcker, Reinhard (2019-11-19)

Carbon capture and utilization technologies can open up new synthesis routes with economic benefits. Recently, the inclusion of carbon dioxide in polyols was extended by copolymerizing double bond agents. This allows for subsequent chain-extension with diisocyanates to polyurethane rubbers. This paper assesses their economic viability. A preliminary techno-economic assessment based on extended ...

Specifying technology readiness levels for the chemical industry

Buchner, Georg A. ; Stepputat, Kai J. ; Zimmermann, Arno W. ; Schomäcker, Reinhard (2019-03-27)

Technology readiness levels (TRLs) have received increasing recognition throughout academia, industry, and policy-making as a tool for evaluating and communicating a technology’s maturity. Conventional scales are unspecific to technologies as they aim at evaluating and comparing technologies combining different fields. Hence, they present vague descriptions which leave considerable room for int...

Techno-economic assessment framework for the chemical industry—Based on technology readiness levels

Buchner, Georg A. ; Zimmermann, Arno W. ; Hohgräve, Arian E. ; Schomäcker, Reinhard (2018-05-30)

For profit-oriented stakeholders techno-economic assessment (TEA) is the most important basis for decisions about research, development, and deployment (RD&D). Two key challenges are, first, the rating of RD&D progress which is closely linked to data availability and, second, the selection of TEA methods that adequately fit the available data in order to achieve the best possible decision basis...

Apples and apples: A shortcut assessment framework for early‐stage carbon capture and utilization technologies based on efficiency, feasibility, and risk

Zimmermann, Arno W. ; Buchner, Georg A. ; Schomäcker, Reinhard (2020-11-24)

Climate change is one of the largest current challenges to humankind, requiring a steep emissions reduction. One promising approach is using CO2 as a resource. Research and development of carbon capture and utilization (CCU) technologies have increased in recent years, putting early‐stage techno‐economic assessment (TEA) in a key role to derive recommendations systematically, to allocate resour...

Techno-economic assessment – methodology development and the case of CO2-containing polyurethane rubbers

Buchner, Georg Alexander (2020)

Well-founded project decisions on the continuation of research, development, and deployment (RD&D) activities are crucial to the success of an economic entity. Decision-makers rely heavily on sound techno-economic assessment (TEA), a systematic approach for judging the economic viability of a technology. A multitude of individual technology characteristics and practitioners’ backgrounds result ...

Recent Progress in Optical Sensors for Biomedical Diagnostics

Pirzada, Muqsit ; Altintas, Zeynep (2020-03-30)

In recent years, several types of optical sensors have been probed for their aptitude in healthcare biosensing, making their applications in biomedical diagnostics a rapidly evolving subject. Optical sensors show versatility amongst different receptor types and even permit the integration of different detection mechanisms. Such conjugated sensing platforms facilitate the exploitation of their n...

Applications of Graphene Quantum Dots in Biomedical Sensors

Mansuriya, Bhargav D. ; Altintas, Zeynep (2020-02-16)

Due to the proliferative cancer rates, cardiovascular diseases, neurodegenerative disorders, autoimmune diseases and a plethora of infections across the globe, it is essential to introduce strategies that can rapidly and specifically detect the ultralow concentrations of relevant biomarkers, pathogens, toxins and pharmaceuticals in biological matrices. Considering these pathophysiologies, vario...

A Guideline for Life Cycle Assessment of Carbon Capture and Utilization

Müller, Leonard Jan ; Kätelhön, Arne ; Bachmann, Marvin ; Zimmermann, Arno ; Sternberg, André ; Bardow, André (2020-02-14)

Carbon Capture and Utilization (CCU) is an emerging field proposed for emissions mitigation and even negative emissions. These potential benefits need to be assessed by the holistic method of Life Cycle Assessment (LCA) that accounts for multiple environmental impact categories over the entire life cycle of products or services. However, even though LCA is a standardized method, current LCA pra...

Techno-Economic Assessment Guidelines for CO2 Utilization

Zimmermann, Arno W. ; Wunderlich, Johannes ; Müller, Leonard ; Buchner, Georg A. ; Marxen, Annika ; Michailos, Stavros ; Armstrong, Katy ; Naims, Henriette ; McCord, Stephen ; Styring, Peter ; Sick, Volker ; Schomäcker, Reinhard (2020-01-31)

Carbon Capture and Utilization (CCU) is an emerging technology field that can replace fossil carbon value chains, and that has a significant potential to achieve emissions mitigation or even “negative emissions”—however in many cases with challenging technology feasibility and economic viability. Further challenges arise in the decision making for CCU technology research, development, and deplo...

Kinetic Investigation of Polyurethane Rubber Formation from CO2‐Containing Polyols

Buchner, Georg A. ; Rudolph, Maik ; Norwig, Jochen ; Marker, Volker ; Gürtler, Christoph ; Schomäcker, Reinhard (2020-01-29)

A novel CO2 utilization technology allows for the inclusion of CO2 as carbonate units and double bond moieties to give additional functionality in polyether polyols. This study examines the chain‐elongation kinetics of these diols with diisocyanates to polyurethane rubbers by means of thermal analysis. A reaction order of 1 indicates a strong influence of the chains' mobility on the reaction ra...

XPS studies on dispersed and immobilised carbon nitrides used for dye degradation

Rieß, Julian ; Lublow, Michael ; Anders, Steven ; Tasbihi, Minoo ; Acharjya, Amitava ; Kailasam, Kamalakannan ; Thomas, Arne ; Schwarze, Michael ; Schomäcker, Reinhard (2019-06-05)

Liquid phase adsorption is a common technique in waste water purification. However, this process has some downsides. The removal of environmentally harmful contaminants from organic liquids by adsorption produces secondary waste which has to be treated afterwards. The treatment can be e.g. high temperatures or a landfill. Photocatalysts such as CN6 can remove the dye under light irradiation but...

Synthese von hochoberflächigen Metalloxiden und geträgerten Metalloxid-Katalysatoren für die oxidative Kupplung von Methan

Klapproth, Miriam (2018)

Methane, which is the main component of biogas and natural gas, is traded as one of the future alternative raw materials to petroleum. To date, methane is mainly used as fuel for energy generation. A further indirect application is the synthesis of high-quality hydrocarbons via the complex synthesis of syngas, which can be synthesized of methane. In comparison to indirect transformations, direc...

Untersuchung des Phasenverhaltens von Mikroemulsionen aus ausgewählten chemischen Reaktionsmischungen im Rahmen der Prozessentwicklung

Kasaka, Yasemin (2016)

Durch die Nutzung der Eigenschaften von Mikroemulsionen können umweltschonende Verfahren für die Wiederverwendung von Katalysatoren und Lösungsmitteln realisiert werden. Bei katalytischen Prozessen ist die Rückführung der wertvollen Edelmetallkatalysatoren für die Wirtschaftlichkeit von entscheidender Bedeutung. Eine detaillierte Analyse der Mikroemulsionssysteme ist der Schlüssel für eine erfo...

A new method to synthesize very active and stable supported metal Pt catalysts: thermo-destabilization of microemulsions

Parapat, Riny Y. ; Parwoto, Veronica ; Schwarze, Michael ; Zhang, Bingsen ; Su, Dang Sheng ; Schomäcker, Reinhard (2012)

A new technique to deposit nanoparticles synthesized in reverse micellar microemulsions onto support material without agglomeration is named thermal destabilization of microemulsion. The multifaceted Pt crystals, mostly truncated octahedra, were produced inside reverse micelles with an average size of 2.5 nm and a narrow size distribution. After deposition, the Pt crystals were found to be well...

Particle shape optimization by changing from an isotropic to an anisotropic nanostructure: preparation of highly active and stable supported Pt catalysts in microemulsions

Parapat, Riny Y. ; Wijaya, Muliany ; Schwarze, Michael ; Selve, Sören ; Willinger, Marc ; Schomäcker, Reinhard (2013)

We recently introduced a new method to synthesize an active and stable Pt catalyst, namely thermo-destabilization of microemulsions (see R. Y. Parapat, V. Parwoto, M. Schwarze, B. Zhang, D. S. Su and R. Schomäcker, J. Mater. Chem., 2012, 22 (23), 11605–11614). We are able to produce Pt nanocrystals with a small size (2.5 nm) of an isotropic structure i.e. truncated octahedral and deposit them w...

Comparison of phase transfer agents in the aqueous biphasic hydroformylation of higher alkenes

Nowothnick, Henriette ; Rost, Anke ; Hamerla, Tobias ; Schomäcker, Reinhard ; Müller, Christian ; Vogt, Dieter (2013)

The Rh-catalyzed aqueous biphasic hydroformylation with the bidentate ligand SulfoXantPhos was investigated for different phase transfer agents (PTA). As such, polymer latices and microemulsions formed by non-ionic surfactants were used. In general, a higher PTA concentration enhances the reaction progress. The feasibility of catalyst recycling by simple phase separation is shown in principle. ...